Marriage is recognized by the US , but they must report it when they get home. It does not affect their alien status.
No. He or she can and will be deported when the authorities notice his or her legal status.
no
Maybe...
The marriage is still legal. And deportation does not invalidate the marriage.
In the UK and Ireland a 'marriage of convenience' as this would be called is illegal.
If by "legal alien" you mean a "resident alien" (i.e., a foreigner with permission to live in the United States) and by "alien" you mean any alien, whether legal or illegal (undocumented), then the answer is yes. Generally, there is no citizenship requirement for marriage in the United States. What effect the marriage will have on the immigration status of the parties involved is another question.
If the marriage license was issued and executed, the marriage is going to be considered legal. It could be annulled, depending on the laws of the state in question.
No. Your second marriage is not legal. In fact, in the United States a married person who knowingly marries again while still married to their first spouse commits bigamy. You need to obtain a legal divorce to dissolve your first marriage.
If you have permission by the government to enter the country (for visit, work, school, etc...) then you are a LEGAL alien If you DO NOT have permission by the government to enter the country, then you are an ILLEGAL alien
Absolutely not.
Absolutely not.
Get on a very long waiting list to get your green card. You wouldn't be an alien if you were legal